Problems uploading .zip files with attachment_fu

I’m using attachment_fu for uploading all of my files and have done so
successfully except when I try to upload zip files.

I continuously get this error: “Size is not included in the list”

I implemented this fix:

but it didn’t work.

Here is my model code:

has_attachment :content_type => ‘application/zip’,
:storage => :file_system,
:path_prefix => ‘…/downloads’,
:max_size => 11102400.kilobytes,
:min_size => 2.kilobytes